313418221 has 2 divisors, whose sum is σ = 313418222. Its totient is φ = 313418220.

The previous prime is 313418197. The next prime is 313418257. The reversal of 313418221 is 122814313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276024996 + 37393225 = 16614^2 + 6115^2 .

It is an emirp because it is prime and its reverse (122814313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313418221 - 2²⁵ = 279863789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313418321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156709110 + 156709111.

It is an arithmetic number, because the mean of its divisors is an integer number (156709111).

Almost surely, 2^313418221 is an apocalyptic number.

It is an amenable number.

313418221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313418221 is an equidigital number, since it uses as much as digits as its factorization.

313418221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 313418221 is about 17703.6216916201. The cubic root of 313418221 is about 679.2684036302.

The spelling of 313418221 in words is "three hundred thirteen million, four hundred eighteen thousand, two hundred twenty-one".